Got the head back from the machine shop and suspect they may have got it wrong. The valve springs have been installed nonuniform. Some have the tight end of the spring up and others down - THAT CANT BE RIGHT? I'm in my 60's but seem to recall that the tight part of the valve spring should always be at the bottom correct? PS. Head is from our D1 but that shouldn't matter as the head design is the same for the RRC. Thanks.